This example recommends a solvent to
be used on some equipment. The solvent recommended depends on the equipment
class, the ventilation of the site, the main material of the equipment and
whether the equipment contains rubber compounds.

The following additional flex technical points are
demonstrated in this example:

This example implements a simple
expert system that recommends a species of tree seed, where to get the seed
from, the normal yield of the seed and how that yield should be varied
according to a description of the location, soil and conditions that hold where
the seed is to be planted.

The following additional flex technical points are
demonstrated in this example:

The automatic asking of questions when an attribute is tested.

The use of group ordering in testing the answer to questions

The difference between setting values for logical and global variables.